Photos: 22 examples of colorful pinball machine backglass

The Rocky Mountain Pinball Showdown and Gameroom Expo went down over the weekend, with more than 100 pinball machines and arcade games available -- no quarters required. (Attendees paid a flat fee.) "We had about 1,800 people," says organizer Daniel Nikolich. "I think it went great, we had a lot of great vendors and speakers received."

"You can't replicate pinball on an Xbox or a Playstation," he adds.

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Indeed you cannot. And the artistic quality of the backlgass -- the upright display on each machine -- may be what sets pinball machines apart from their digital counter-parts. Here are the best examples of backlgass art found by photographer Chris Morgan.